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iiiFOREWORDAs a consequence of preparation of the quarterly technical progressreview Nuclear Safety, it became apparent both to the Oak Ridge NationalLaboratory editorial staff and to cognizant persons in the AEC Divisionof Reactor Development that there existed a wealth of uncorrelated infor-mation on the subject of reactor containment. Accordingly, in the fall of1962, the Laboratory was authorized to undertake the present compilation,which was essentially completed in its present form in the spring of 1964.In an effort to make the compilation as comprehensive and as authori-tative as practical, the Laboratory subcontracted the responsibility forpreparation of four of the 12 chapters (i.e., Chapters 8, 9, 10, and 11)to Bechtel Corporation, a major architect-engineer and fabricator of re-actor containment structures. The authorship of the remaining chapterswas then assigned to senior Laboratory personnel, supplemented in manyinstances by experts from other installations. Thus in addition to theliterally hundreds of persons who reviewed the various drafts, numerouspersons have made substantial original contributions to this work. Al-though these persons and the extent of their contribution are indicatedat the beginning of each chapter, they are all listed alphabetically be-low in order that we may collectively acknowledge their contributions.